Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (0, 0, 1), (0, 1, -1), (1, 0, 1), (1, 1, 1)}.
A151220
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (0, 0, 1), (0, 1, -1), (1, 0, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =56a(4) =258a(5) =1208a(6) =5749a(7) =27646a(8) =133968a(9) =652592a(10) =3193440a(11) =15676731a(12) =77165036a(13) =380650135a(14) =1880986314a(15) =9308619584a(16) =46122972729a(17) =228769029625
External references
- oeis: A151220